Abstract: In view of the hiddentrouble of SHJ（Sha Hejie）crude oil transported safely through offshore pipeline in Bozhong oil Block, the wax crystallization of SHJ crude oil is observed and analyzed by using an image analysis system and necceary programin water bath at the temperature range from 65℃ to 20℃, and then its wax precipitation point and the peak temperature are determined. The rheological and emulsified properties of SHJ crude oil and its emulsions formed with the produced water of a nearby water source well are measured and evaluated by using a HAAKE RS600 rheometer. The experimental results indicate that the wax appearance point and viscosityabnormal point of the oil is 51℃ and 30℃ respectively, and its wax precipitation peak temperature is between 35℃ and 20℃. While the amount of added water is below 70%, the mixture of oil and water, stirred at 700-800 r/min within 2 hours and cooled naturally from 80℃ at 25℃ room temperature, can be emulsified completely. The inverted point of the emulsion is about 70%. The experimental methods can provide the related research for a reference and the results provide a guide to the safe operation of SHJ crude oil transported by adding some high temperature water.

Key words: waxy crude oil, wax crystallization, emulsion, inverted point, rheological properties